Although many different kinds of animals can serve as intermediate hosts for the parasites, cats are the only animals known to shed the parasite's eggs in their droppings. (In fact, this cat-parasite link is the reason pregnant women are advised against cleaning cat litter boxes.) Because of this danger, cat poop should not be flushed because it can then be carried via storm drains and sewage outflows into near-shore ocean waters. But, what about those indoor cats? Find out when you

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Even cats who don't make it outside could still be at risk from a mouse in the house, for example. In fact, California’s legislature passed a bill in 2006 to protect sea otters, in part by requiring that all cat litter sold in the state carry a warning label advising cat owners not to flush cat litter or dispose of it in storm drains. They recommend that litter always be discarded in trashbags so it will end up in a landfill where precautions are taken to prevent environmental contamination.